The announcement may just be posturing, and really is just a restatement of what they previously said they wanted to do with the AZ site.
The market interprets it as Intel not getting bought or possibly even invested in by TSMC, so takes off the previous rally.
If Taiwan refuses to allow TSMC to do leading edge in the US, they could still build more fabs (as planned all along), and might still want to invest in IFS if it is spun off from Intel (or if most of the Product groups are sold, making Intel=IFS).
So the news is a negative but maybe not as bad as some are thinking. Intel will certainly lose headcount to TSMC, and should get much more serious about selling off all the Non-EUV fabs to GF, in order to shed debt and fund future technology development.
The conglomerate is no longer able to fund TD and it is clear that the BOD recognizes that. As the saying goes, the platform is burning and it is time to get real about that as well. Nokia still exists because they recognized their phone business was going to be wiped out by smartphones and got rid of that business. Intel needs to accelerate the disintegration of IDM, while the various groups and divisions still have some lingering value.
Absent some urgent action by the BOD, the stock is now in a position to follow the sector into a retest possibly as deep as 2000-2002, as all the excess of the past decade get unwound.
This could get ugly.